Summary
To meet the growing global electricity demand driven by population growth and extensive industrialization, the expansion of energy infrastructure is indispensable. To address global warming and achieve net-zero emissions targets, this expansion must prioritize the development and deployment of renewable or green energy sources. For efficient transmission of electricity from generation to end users, direct current (DC) transmission is the most suitable technology, particularly for high power levels and very long distances, where alternating current (AC) is less efficient. The state-of-the-art extra high voltage (EHV)
Read more Read lessDC cable technology is deployed in the Qingzhou 5 and 7 offshore wind projects, each with an installed capacity of 1000 MW. The transition to higher DC transmission voltage for
XLPE insulated cables introduces significant technical challenges. This paper presents key design and engineering aspects of a 500 kV EHVDC cable, including system parameters, insulation design methodology, and transfer of qualification from previously qualified systems in accordance with CIGRE TB 852, considering electrical stresses, thermal performance, and conductor cross-section. Advanced simulation software is used to evaluate current carrying capacity under various installation scenarios based on IEC standards. Key cable layer designs and critical issues are also discussed. Additionally, a metal armour layer is incorporated for protection during handling, transport, and installation, with mechanical design considerations addressing water depth, maximum pulling tension, and stress distribution between armour and conductor in line with CIGRE TB 623.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | B1_11517_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | China, People's Republic of |
| Study committees | |
| File size | 1 MB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
AWAIS Muhammad - Ningbo Orient Wires & Cables Co., Ltd.; ZHAO Yuantao - Ningbo Orient Wires & Cables Co., Ltd.; XIA Feng - Ningbo Orient Wires & Cables Co., Ltd.; YANG Jianjun - Ningbo Orient Wires & Cables Co., Ltd.; YU Guojun - Ningbo Orient Wires & Cables Co., Ltd.; KOSTAS Pouleros - Ningbo Orient Wires & Cables Co., Ltd.
Keywords
Offshore wind farm, ±500 kV EHVDC submarine cable, Extra-high voltage, XLPE
